package cn.kgc.zuxin.filter;

import cn.kgc.zuxin.common.BaseContext;
import cn.kgc.zuxin.common.R;
import com.alibaba.fastjson.JSON;
import lombok.extern.slf4j.Slf4j;
import org.springframework.util.AntPathMatcher;

import javax.servlet.*;
import javax.servlet.annotation.WebFilter;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;
import java.io.IOException;

/**
 * 检查用户是否登录过滤器
 *
 * @author : 磊
 * Creat Date : 2022/10/18 15:26
 */

@WebFilter(filterName = "LoginCheckFilter", urlPatterns = "/*")
@Slf4j
public class


LoginCheckFilter implements Filter {
    //路径匹配器,支持通配符
    public static final AntPathMatcher PATH_MATCHER = new AntPathMatcher();

    @Override
    public void doFilter(ServletRequest servletRequest, ServletResponse servletResponse, FilterChain filterChain) throws IOException, ServletException {
        HttpServletRequest request = (HttpServletRequest) servletRequest;
        HttpServletResponse response = (HttpServletResponse) servletResponse;

        //1.获取本次请求的uri
        String requestURI = request.getRequestURI();
        log.info("拦截到请求: {}", requestURI);

        //定义不需要处理的请求路径
        String[] urls = new String[]{"/employee/login", "/employee/logout", "/backend/**", "/front/**", "/user/sendMsg",
                "/user/login","/test"};

        //2.判断本次请求是否需要处理
        boolean check = check(urls, requestURI);

        //3.如果不需要处理直接放行
        if (check) {
            log.info("本次不需要处理的请求: {}", requestURI);
            filterChain.doFilter(request, response);
            return;
        }

        //4.判断登录状态,如果已登录,则直接放行
//        System.err.println(request.getSession().getAttribute("employee"));
        if (request.getSession().getAttribute("employee") != null) {
            log.info("用户已登录,用户ID为: {}", request.getSession().getAttribute("employee"));
            filterChain.doFilter(request, response);
            return;
        }

        //4-2、判断登录状态，如果已登录，则直接放行
        if (request.getSession().getAttribute("user") != null) {
            log.info("用户已登录，用户id为：{}", request.getSession().getAttribute("user"));

            Long userId = (Long) request.getSession().getAttribute("user");
            BaseContext.setCurrentId(userId);

            filterChain.doFilter(request, response);
            return;
        }

        log.info("用户未登录");
        //5.如果未登录,则返回未登录,通过输出流方式,向客户端页面响应数据
        response.getWriter().write(JSON.toJSONString(R.error("NOTLOGIN")));
        return;

    }


    /**
     * 路径匹配,检查本次请求是否放行
     *
     * @param requestURI
     * @return
     */
    public boolean check(String[] urls, String requestURI) {
        for (String url : urls) {
            boolean match = PATH_MATCHER.match(url, requestURI);
            if (match) {
                return true;
            }
        }
        return false;
    }
}
